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Prepaid and Other Current Assets
 6 Months Ended
Jun. 30, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Prepaid and Other Current Assets Prepaid and Other Current Assets
    Prepaid and other current assets at June 30, 2021 and December 31, 2020 consisted of the following (in thousands):
June 30, 2021December 31, 2020
Advances to suppliers$3,966 $— 
Collateral posted with broker for derivative instruments (1)410 1,489 
Prepaid insurance5,147 14,932 
Derivative assets3,953 1,346 
Other6,332 6,881 
Total$19,808 $24,648 
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(1)Our cash margin that is required as collateral deposits on our commodity derivatives cannot be offset against the fair value of open contracts except in the event of default. Please read Note 10—Derivatives for further information.